There Is No Hot Water; The Dhw Is Too Hot; Flashes On The Display - Viessmann Vitotronic 100 Operating Instructions Manual

Troubleshooting

There is no Hot Water

Cause
The heating system is off.
Control unit is incorrectly adjusted.
No fuel..

The symbol is shown on the
display.

The DHW is Too Hot

Cause
The control unit is incorrectly
adjusted.
DHW heating is carried out by the
solar thermal system.
Emissions test switch is set to
"

" Flashes on the Display


Cause
Heating system fault.
" " Flashes on the Display
Cause
The time for a service, as specified by your heating
contractor, has arrived.
16
Remedy
- Switch the ON/OFF switch ON (see page 8).
- Switch ON the mains isolator, if installed (outside the boiler room).
- Reset the fuse/MCB in the power distribution board (main domestic fuse/ MCB).
Check settings and correct if required:
- DHW heating must be enabled (see page 10).
- Set DHW temperature (see page 10).
For LPG/oil:
Check the fuel reserves and re-order if required.
For natural gas:
Open the gas shut-off valve.
If necessary, check with your gas supply utility.
Scan the type of fault, make a note of the fault code and acknowledge the
message (see page 14).
If necessary, notify your heating contractor.
Remedy
Check DHW temperature and correct if required (see page 10).
Check settings and correct, if required, at the solar control unit.
Separate operating instructions
Close the cover (see page 6).
.
S
Remedy
Scan the type of fault, make a note of the fault code and
acknowledge the message (see page 14).
If necessary, notify your heating contractor.
Remedy
Notify your heating contractor and acknowledge the service
message with OK (see page 13).
Vitotronic 100, GC1B Operating